Galaga came out in 1981 and is the sequel to Galaxian. Like Galaxian, Galaga is a space shooter. Unlike Galaxian, in Galaga each level starts with no aliens. Several waves of aliens fly in and take up formation at the top of the screen, after which a few aliens at a time will dive and attack the player’s ship. One particular type of alien, called “Galagas,” occasionally use a tractor beam to try to capture the player’s ship. If the player’s ship is captured (and the player still has additional ships), the player can attempt to free the captured ship by destroying the Galaga which captured it. Once the captured ship is freed, it joins the other player ship at the bottom of the screen, and both ships fight the aliens side-by-side.

Galaga was produced by Namco and distributed in North America by Midway.

The first time I tried Dig Dug I didn’t expect to like it. A video game about digging? Come on. But once I tried it I found that I really liked it. The main character is Taizo Hori (in Japanese HORI Taizo, a pun on the Japanese phrase meaning “I want to dig!”), a miner in a white suit who carries an air pump and a shovel. The object of the game is to tunnel through the dirt and destroy Pookas (anthropomorphic red balls with goggles) and Fygars (dragons). The enemies can be destroyed by tunneling under a rock while they follow you, then moving out of the way so it drops on your enemies, or by inflating them with your air pump until they burst.

Dig Dig was created in 1982 by Namco and distributed in North America by Atari.

Galaxian, while not an official sequel to Space Invaders, was its spiritual successor. Like Space Invaders, in Galaxian the player controls a ship which shoots at aliens flying in formation. However, in Galaxian there are no shields for the player to hide behind, and the aliens leave formation to attack the player.

Galaxian was the first game to feature multi-color sprites. It was created in 1979 by Kazunori Sawano, Kōichi Tashiro and Shigekazu Ishimura for Namco and distributed in North America by Midway.

Pac-Man is one of the most popular games of all time. Gameplay is very simple: the player controls Pac-Man, moving him around a maze eating dots while being chased by four ghosts: Blinky (red), Pinky (pink), Inky (light blue), and Clyde (orange). Each level has four larger dots which when eaten turn all the ghosts blue, making them temporarily vulnerable to being eaten by Pac-Man. When a level is cleared of all its dots the level ends and the next level begins.

The game’s creator, Toru Iwatani, has said that the shape of Pac-Man was inspired by a pizza with a missing slice. The game was released by Namco in Japan, and distributed in North America by Midway.